Kernel: Unveil does not handle "../"

[shannonbooth]

Already a known issue, but making for visibility in case someone wants to work on it.

serenity/Kernel/FileSystem/VirtualFileSystem.cpp

Lines 724 to 726 in 1d2986e

	// FIXME: Figure out a nicer way to do this.
	if (String(path).contains("/.."))
	return KResult(-EINVAL);

Effectively the kernel will always reject any paths containing a "../" if the process has a veil, but the final resolved path may still be valid. In these cases the kernel should successfully resolve and handle the path.

[muscar]

I'll see if I can come up with something for this.

[muscar]

A work-around for this has been merged.